branch-3.1: [fix](hive)fix querying hive text table with NULL DEFINED AS '' #55626 #55661
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### What problem does this PR solve? Problem Summary: This pull request improves the handling of empty string null formats and delimiter properties for Hive external tables, ensuring more robust and consistent behavior when parsing data. For hive text table like this: ```sql CREATE TABLE test_empty_null_defined_text ( id INT, name STRING ) ROW FORMAT DELIMITED FIELDS TERMINATED BY '\t' NULL DEFINED AS '' STORED AS TEXTFILE; INSERT INTO TABLE test_empty_null_defined_text VALUES (1, 'Alice'), (2, NULL); ``` Query in Doris: ```sql select * from test_empty_null_defined_text; ``` Before Result: ```text +------+-------+ | id | name | +------+-------+ | 1 | Alice | | 2 | | +------+-------+ ``` After Result: ```text +------+-------+ | id | name | +------+-------+ | 1 | Alice | | 2 | NULL | +------+-------+ ```
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run buildall |
TPC-H: Total hot run time: 32757 ms |
TPC-DS: Total hot run time: 192440 ms |
ClickBench: Total hot run time: 28.51 s |
BE UT Coverage ReportIncrement line coverage Increment coverage report
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BE Regression && UT Coverage ReportIncrement line coverage Increment coverage report
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morrySnow
approved these changes
Sep 5, 2025
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Cherry-picked from #55626